Just ordered a 1" thick 4x8 sheet and 3/4 thick 4x8 sheet of HDU, both 15lb density. Wasn’t cheap by any means, but you get what you pay for and when you are putting a product out that potentially hundreds of people daily(at least in my case) will see, why wouldn’t you want the best product and your best work shown? Its going to be an outdoor sign for a local business in a downtown area that is busy. I’ll have quite a bit left over for other orders, or FINALLY carving out my own logo to hang on the wall over my CNC. Luckily I found a supplier a little over an hour from me so I can go pick it up. You can call the people at Coastal Enterprises and they will give you info on any distributors near you like they did me. Super nice people. They will also send you free small sample to experiment with on painting and carving, and their website has a TON of information on working with it.